▼ Menu

    
Extras ▼

The EF54 is a VHF high-slope pentode and has a sharp cut-off, the 5A/156M is the Type designation for the valve made by STC.

The cathode is brought out to several pins to provide a low inductance path, part way to a ring connection as found in co-axial valves. A feature of the design is aligned grids that provide conditions to reduce partition noise.

The 5A/156M was capable of operation up to 200 MHz.

The reverse is a plain aluminium screening can over the all-glass valve inside.

The wide glass tube envelope is 33 mm in diameter and, excluding the B9G base pins, is 60 mm tall.

References: Data-sheet & ¹⁰⁴³. Type 5A/156M was first introduced in 1947. See also 1947 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.